feat(tui): resolve resume titles through the projection cache

session-title already registers a title projection unit; /resume now
reads it instead of scanning logs: live rows from the registry
snapshot, persisted rows from the durable checkpoint row
(cachedSnapshot, zero I/O), and only rows without a usable checkpoint
pay a coldSnapshot — checkpoint plus readFrom tail, written back so the
next scan is metadata-only. Cold reads are bounded by the new
resumeScanConcurrency config; compositions without the cache fall back
to the bounded readTitleSnapshots batch. The TUI overlay mounts the
projection registry, storage, and projection-cache rows over the same
storages root the web surface uses, so checkpoints serve both.

docs/config-catalog.md

@@ -2075,6 +2075,8 @@ export interface TuiConfig {
   maxModelOptions?: number
   /** Maximum sessions visible at once in the resume selector. */
   maxResumeOptions?: number
+  /** Maximum concurrent cold projection reads in one resume scan. */
+  resumeScanConcurrency?: number
   /** User-question panel width in terminal columns, clamped to the terminal. */
   questionDialogWidth?: number
   /** User-question panel maximum height in terminal rows. */
@@ -2116,7 +2118,7 @@ export interface TuiThemeConfig {
 }
 ```
 
-Source: [`packages/ui/tui/src/config.ts:125`](../packages/ui/tui/src/config.ts)
+Source: [`packages/ui/tui/src/config.ts:129`](../packages/ui/tui/src/config.ts)
 
 ## `@deepseek-ai/dsh-typert-loader`